Kamen Rider Manga Story Starting from Amazon

Two years ago, due to an experimental accident, 4,000 human-devouring experimental bodies called Amazons flooded into the city. Late one night after the Rain God Plan was implemented, a firefly "Amazon" invaded Nozama. Yan, who had been transformed into a fourth category Amazon "Sigma" by her sister, was awakened to fight against the enemy, but she suddenly disappeared when she was about to kill the opponent. When he opened his eyes again, he found that he was already in a strange environment. Through the memory in his mind, he knew... That he had traveled through time! Traveling through countless worlds, how will he create his own legend?